# SPDX-License-Identifier: AGPL-3.0-or-later """Searx preferences implementation. """ # pylint: disable=useless-object-inheritance from base64 import urlsafe_b64encode, urlsafe_b64decode from zlib import compress, decompress from urllib.parse import parse_qs, urlencode from typing import Iterable, Dict, List, Optional from collections import OrderedDict import flask import babel from searx import settings, autocomplete, favicons from searx.enginelib import Engine from searx.plugins import Plugin from searx.locales import LOCALE_NAMES from searx.webutils import VALID_LANGUAGE_CODE from searx.engines import DEFAULT_CATEGORY COOKIE_MAX_AGE = 60 * 60 * 24 * 365 * 5 # 5 years DOI_RESOLVERS = list(settings['doi_resolvers']) MAP_STR2BOOL: Dict[str, bool] = OrderedDict( [ ('0', False), ('1', True), ('on', True), ('off', False), ('True', True), ('False', False), ('none', False), ] ) class ValidationException(Exception): """Exption from ``cls.__init__`` when configuration value is invalid.""" class Setting: """Base class of user settings""" def __init__(self, default_value, locked: bool = False): super().__init__() self.value = default_value self.locked = locked def parse(self, data: str): """Parse ``data`` and store the result at ``self.value`` If needed, its overwritten in the inheritance. """ self.value = data def get_value(self): """Returns the value of the setting If needed, its overwritten in the inheritance. """ return self.value def save(self, name: str, resp: flask.Response): """Save cookie ``name`` in the HTTP response object If needed, its overwritten in the inheritance.""" resp.set_cookie(name, self.value, max_age=COOKIE_MAX_AGE) class StringSetting(Setting): """Setting of plain string values""" class EnumStringSetting(Setting): """Setting of a value which can only come from the given choices""" def __init__(self, default_value: str, choices: Iterable[str], locked=False): super().__init__(default_value, locked) self.choices = choices self._validate_selection(self.value) def _validate_selection(self, selection: str): if selection not in self.choices: raise ValidationException('Invalid value: "{0}"'.format(selection)) def parse(self, data: str): """Parse and validate ``data`` and store the result at ``self.value``""" self._validate_selection(data) self.value = data class MultipleChoiceSetting(Setting): """Setting of values which can only come from the given choices""" def __init__(self, default_value: List[str], choices: Iterable[str], locked=False): super().__init__(default_value, locked) self.choices = choices self._validate_selections(self.value) def _validate_selections(self, selections: List[str]): for item in selections: if item not in self.choices: raise ValidationException('Invalid value: "{0}"'.format(selections)) def parse(self, data: str): """Parse and validate ``data`` and store the result at ``self.value``""" if data == '': self.value = [] return elements = data.split(',') self._validate_selections(elements) self.value = elements def parse_form(self, data: List[str]): if self.locked: return self.value = [] for choice in data: if choice in self.choices and choice not in self.value: self.value.append(choice) def save(self, name: str, resp: flask.Response): """Save cookie ``name`` in the HTTP response object""" resp.set_cookie(name, ','.join(self.value), max_age=COOKIE_MAX_AGE) class SetSetting(Setting): """Setting of values of type ``set`` (comma separated string)""" def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.values = set() def get_value(self): """Returns a string with comma separated values.""" return ','.join(self.values) def parse(self, data: str): """Parse and validate ``data`` and store the result at ``self.value``""" if data == '': self.values = set() return elements = data.split(',') for element in elements: self.values.add(element) def parse_form(self, data: str): if self.locked: return elements = data.split(',') self.values = set(elements) def save(self, name: str, resp: flask.Response): """Save cookie ``name`` in the HTTP response object""" resp.set_cookie(name, ','.join(self.values), max_age=COOKIE_MAX_AGE) class SearchLanguageSetting(EnumStringSetting): """Available choices may change, so user's value may not be in choices anymore""" def _validate_selection(self, selection): if selection != '' and selection != 'auto' and not VALID_LANGUAGE_CODE.match(selection): raise ValidationException('Invalid language code: "{0}"'.format(selection)) def parse(self, data: str): """Parse and validate ``data`` and store the result at ``self.value``""" if data not in self.choices and data != self.value: # hack to give some backwards compatibility with old language cookies data = str(data).replace('_', '-') lang = data.split('-', maxsplit=1)[0] if data in self.choices: pass elif lang in self.choices: data = lang else: data = self.value self._validate_selection(data) self.value = data class MapSetting(Setting): """Setting of a value that has to be translated in order to be storable""" def __init__(self, default_value, map: Dict[str, object], locked=False): # pylint: disable=redefined-builtin super().__init__(default_value, locked) self.map = map if self.value not in self.map.values(): raise ValidationException('Invalid default value') def parse(self, data: str): """Parse and validate ``data`` and store the result at ``self.value``""" if data not in self.map: raise ValidationException('Invalid choice: {0}'.format(data)) self.value = self.map[data] self.key = data # pylint: disable=attribute-defined-outside-init def save(self, name: str, resp: flask.Response): """Save cookie ``name`` in the HTTP response object""" if hasattr(self, 'key'): resp.set_cookie(name, self.key, max_age=COOKIE_MAX_AGE) class BooleanSetting(Setting): """Setting of a boolean value that has to be translated in order to be storable""" def normalized_str(self, val): for v_str, v_obj in MAP_STR2BOOL.items(): if val == v_obj: return v_str raise ValueError("Invalid value: %s (%s) is not a boolean!" % (repr(val), type(val))) def parse(self, data: str): """Parse and validate ``data`` and store the result at ``self.value``""" self.value = MAP_STR2BOOL[data] self.key = self.normalized_str(self.value) # pylint: disable=attribute-defined-outside-init def save(self, name: str, resp: flask.Response): """Save cookie ``name`` in the HTTP response object""" if hasattr(self, 'key'): resp.set_cookie(name, self.key, max_age=COOKIE_MAX_AGE) class BooleanChoices: """Maps strings to booleans that are either true or false.""" def __init__(self, name: str, choices: Dict[str, bool], locked: bool = False): self.name = name self.choices = choices self.locked = locked self.default_choices = dict(choices) def transform_form_items(self, items): return items def transform_values(self, values): return values def parse_cookie(self, data_disabled: str, data_enabled: str): for disabled in data_disabled.split(','): if disabled in self.choices: self.choices[disabled] = False for enabled in data_enabled.split(','): if enabled in self.choices: self.choices[enabled] = True def parse_form(self, items: List[str]): if self.locked: return disabled = self.transform_form_items(items) for setting in self.choices: self.choices[setting] = setting not in disabled @property def enabled(self): return (k for k, v in self.choices.items() if v) @property def disabled(self): return (k for k, v in self.choices.items() if not v) def save(self, resp: flask.Response): """Save cookie in the HTTP response object""" disabled_changed = (k for k in self.disabled if self.default_choices[k]) enabled_changed = (k for k in self.enabled if not self.default_choices[k]) resp.set_cookie('disabled_{0}'.format(self.name), ','.join(disabled_changed), max_age=COOKIE_MAX_AGE) resp.set_cookie('enabled_{0}'.format(self.name), ','.join(enabled_changed), max_age=COOKIE_MAX_AGE) def get_disabled(self): return self.transform_values(list(self.disabled)) def get_enabled(self): return self.transform_values(list(self.enabled)) class EnginesSetting(BooleanChoices): """Engine settings""" def __init__(self, default_value, engines: Iterable[Engine]): choices = {} for engine in engines: for category in engine.categories: if not category in list(settings['categories_as_tabs'].keys()) + [DEFAULT_CATEGORY]: continue choices['{}__{}'.format(engine.name, category)] = not engine.disabled super().__init__(default_value, choices) def transform_form_items(self, items): return [item[len('engine_') :].replace('_', ' ').replace(' ', '__') for item in items] def transform_values(self, values): if len(values) == 1 and next(iter(values)) == '': return [] transformed_values = [] for value in values: engine, category = value.split('__') transformed_values.append((engine, category)) return transformed_values class PluginsSetting(BooleanChoices): """Plugin settings""" def __init__(self, default_value, plugins: Iterable[Plugin]): super().__init__(default_value, {plugin.id: plugin.default_on for plugin in plugins}) def transform_form_items(self, items): return [item[len('plugin_') :] for item in items] class ClientPref: """Container to assemble client prefferences and settings.""" # hint: searx.webapp.get_client_settings should be moved into this class locale: babel.Locale """Locale prefered by the client.""" def __init__(self, locale: Optional[babel.Locale] = None): self.locale = locale @property def locale_tag(self): if self.locale is None: return None tag = self.locale.language if self.locale.territory: tag += '-' + self.locale.territory return tag @classmethod def from_http_request(cls, http_request: flask.Request): """Build ClientPref object from HTTP request. - `Accept-Language used for locale setting `__ """ al_header = http_request.headers.get("Accept-Language") if not al_header: return cls(locale=None) pairs = [] for l in al_header.split(','): # fmt: off lang, qvalue = [_.strip() for _ in (l.split(';') + ['q=1',])[:2]] # fmt: on try: qvalue = float(qvalue.split('=')[-1]) locale = babel.Locale.parse(lang, sep='-') except (ValueError, babel.core.UnknownLocaleError): continue pairs.append((locale, qvalue)) locale = None if pairs: pairs.sort(reverse=True, key=lambda x: x[1]) locale = pairs[0][0] return cls(locale=locale) class Preferences: """Validates and saves preferences to cookies""" def __init__( self, themes: List[str], categories: List[str], engines: Dict[str, Engine], plugins: Iterable[Plugin], client: Optional[ClientPref] = None, ): super().__init__() self.key_value_settings: Dict[str, Setting] = { # fmt: off 'categories': MultipleChoiceSetting( ['general'], locked=is_locked('categories'), choices=categories + ['none'] ), 'language': SearchLanguageSetting( settings['search']['default_lang'], locked=is_locked('language'), choices=settings['search']['languages'] + [''] ), 'locale': EnumStringSetting( settings['ui']['default_locale'], locked=is_locked('locale'), choices=list(LOCALE_NAMES.keys()) + [''] ), 'autocomplete': EnumStringSetting( settings['search']['autocomplete'], locked=is_locked('autocomplete'), choices=list(autocomplete.backends.keys()) + [''] ), 'favicon_resolver': EnumStringSetting( settings['search']['favicon_resolver'], locked=is_locked('favicon_resolver'), choices=list(favicons.proxy.CFG.resolver_map.keys()) + [''] ), 'image_proxy': BooleanSetting( settings['server']['image_proxy'], locked=is_locked('image_proxy') ), 'method': EnumStringSetting( settings['server']['method'], locked=is_locked('method'), choices=('GET', 'POST') ), 'safesearch': MapSetting( settings['search']['safe_search'], locked=is_locked('safesearch'), map={ '0': 0, '1': 1, '2': 2 } ), 'theme': EnumStringSetting( settings['ui']['default_theme'], locked=is_locked('theme'), choices=themes ), 'results_on_new_tab': BooleanSetting( settings['ui']['results_on_new_tab'], locked=is_locked('results_on_new_tab') ), 'doi_resolver': MultipleChoiceSetting( [settings['default_doi_resolver'], ], locked=is_locked('doi_resolver'), choices=DOI_RESOLVERS ), 'simple_style': EnumStringSetting( settings['ui']['theme_args']['simple_style'], locked=is_locked('simple_style'), choices=['', 'auto', 'light', 'dark', 'black'] ), 'center_alignment': BooleanSetting( settings['ui']['center_alignment'], locked=is_locked('center_alignment') ), 'advanced_search': BooleanSetting( settings['ui']['advanced_search'], locked=is_locked('advanced_search') ), 'query_in_title': BooleanSetting( settings['ui']['query_in_title'], locked=is_locked('query_in_title') ), 'infinite_scroll': BooleanSetting( settings['ui']['infinite_scroll'], locked=is_locked('infinite_scroll') ), 'search_on_category_select': BooleanSetting( settings['ui']['search_on_category_select'], locked=is_locked('search_on_category_select') ), 'hotkeys': EnumStringSetting( settings['ui']['hotkeys'], choices=['default', 'vim'] ), # fmt: on } self.engines = EnginesSetting('engines', engines=engines.values()) self.plugins = PluginsSetting('plugins', plugins=plugins) self.tokens = SetSetting('tokens') self.client = client or ClientPref() self.unknown_params: Dict[str, str] = {} def get_as_url_params(self): """Return preferences as URL parameters""" settings_kv = {} for k, v in self.key_value_settings.items(): if v.locked: continue if isinstance(v, MultipleChoiceSetting): settings_kv[k] = ','.join(v.get_value()) else: settings_kv[k] = v.get_value() settings_kv['disabled_engines'] = ','.join(self.engines.disabled) settings_kv['enabled_engines'] = ','.join(self.engines.enabled) settings_kv['disabled_plugins'] = ','.join(self.plugins.disabled) settings_kv['enabled_plugins'] = ','.join(self.plugins.enabled) settings_kv['tokens'] = ','.join(self.tokens.values) return urlsafe_b64encode(compress(urlencode(settings_kv).encode())).decode() def parse_encoded_data(self, input_data: str): """parse (base64) preferences from request (``flask.request.form['preferences']``)""" bin_data = decompress(urlsafe_b64decode(input_data)) dict_data = {} for x, y in parse_qs(bin_data.decode('ascii'), keep_blank_values=True).items(): dict_data[x] = y[0] self.parse_dict(dict_data) def parse_dict(self, input_data: Dict[str, str]): """parse preferences from request (``flask.request.form``)""" for user_setting_name, user_setting in input_data.items(): if user_setting_name in self.key_value_settings: if self.key_value_settings[user_setting_name].locked: continue self.key_value_settings[user_setting_name].parse(user_setting) elif user_setting_name == 'disabled_engines': self.engines.parse_cookie(input_data.get('disabled_engines', ''), input_data.get('enabled_engines', '')) elif user_setting_name == 'disabled_plugins': self.plugins.parse_cookie(input_data.get('disabled_plugins', ''), input_data.get('enabled_plugins', '')) elif user_setting_name == 'tokens': self.tokens.parse(user_setting) elif not any( user_setting_name.startswith(x) for x in ['enabled_', 'disabled_', 'engine_', 'category_', 'plugin_'] ): self.unknown_params[user_setting_name] = user_setting def parse_form(self, input_data: Dict[str, str]): """Parse formular (````) data from a ``flask.request.form``""" disabled_engines = [] enabled_categories = [] disabled_plugins = [] # boolean preferences are not sent by the form if they're false, # so we have to add them as false manually if they're not sent (then they would be true) for key, setting in self.key_value_settings.items(): if key not in input_data.keys() and isinstance(setting, BooleanSetting): input_data[key] = 'False' for user_setting_name, user_setting in input_data.items(): if user_setting_name in self.key_value_settings: self.key_value_settings[user_setting_name].parse(user_setting) elif user_setting_name.startswith('engine_'): disabled_engines.append(user_setting_name) elif user_setting_name.startswith('category_'): enabled_categories.append(user_setting_name[len('category_') :]) elif user_setting_name.startswith('plugin_'): disabled_plugins.append(user_setting_name) elif user_setting_name == 'tokens': self.tokens.parse_form(user_setting) else: self.unknown_params[user_setting_name] = user_setting self.key_value_settings['categories'].parse_form(enabled_categories) self.engines.parse_form(disabled_engines) self.plugins.parse_form(disabled_plugins) # cannot be used in case of engines or plugins def get_value(self, user_setting_name: str): """Returns the value for ``user_setting_name``""" ret_val = None if user_setting_name in self.key_value_settings: ret_val = self.key_value_settings[user_setting_name].get_value() if user_setting_name in self.unknown_params: ret_val = self.unknown_params[user_setting_name] return ret_val def save(self, resp: flask.Response): """Save cookie in the HTTP response object""" for user_setting_name, user_setting in self.key_value_settings.items(): # pylint: disable=unnecessary-dict-index-lookup if self.key_value_settings[user_setting_name].locked: continue user_setting.save(user_setting_name, resp) self.engines.save(resp) self.plugins.save(resp) self.tokens.save('tokens', resp) for k, v in self.unknown_params.items(): resp.set_cookie(k, v, max_age=COOKIE_MAX_AGE) return resp def validate_token(self, engine): valid = True if hasattr(engine, 'tokens') and engine.tokens: valid = False for token in self.tokens.values: if token in engine.tokens: valid = True break return valid def is_locked(setting_name: str): """Checks if a given setting name is locked by settings.yml""" if 'preferences' not in settings: return False if 'lock' not in settings['preferences']: return False return setting_name in settings['preferences']['lock']